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DIRVOS BIOAKTYVUMO IR PIKTŽOLIŲ PLITIMO TYRIMAI SKIRTINGO TANKUMO VASARINIŲ RAPSŲ AGROCENOZĖSE / Investigation of soil bioactivity and weed infestation in spring oilseed rape agrocoenosis of different density

Investigation of soil bioactivity and weed infestation in spring oilseed rape agrocoenosis of different density

Aušra Grybaitė

Field experiments were carried out in 2004 and 2005 at the Experimental Station of Lithuanian University of Agriculture to study the influence of different spring oilseed rape (Brassica napus L.) ‘Sponsor’ densities (50.1-100, 100.1-150, 150.1-200, 200.1-250, 250.1-300, 300.1-350, 350.1-400, 400.1-450 plants m-2) on soil bioactivity and weed infestation. Soil - Calc(ar)i-Endohypogleyic Luvisol.
By increasing of spring oilseed rape crop urease activity in the soil didn’t chage significantly. The saccharase activity in the rape agrocoenosis with density more than 150.1 plants m-2 significantly increased in comparison with saccharase activity in the thinest rape agrocoenosis. The content of humus (r = 0.73, P < 0.05) and available phosphorus (r = 0.71, P < 0.05) influenced the saccharase activity.
Spring oilseed rape crop density had no influence on number of weed species, weed sprouts and weed density before harvest. Efficiency of weed suppressing increased when weed density in crop at 3-4 leaves stage increased. This proved the small similarity indexes of weed density in crop at 3-4 leaves stage and before harvest. Rape crop density had no influence on weed species change. Significant negative relationship was found between weed air-dry biomass and rape crop density (r = -0.82, P < 0.01).
Most of weeds in rape crop were therophytes. Most of them... [to full text]

Identiferoai:union.ndltd.org:LABT_ETD/oai:elaba.lt:LT-eLABa-0001:E.02~2006~D_20060609_110947-63859
Date09 June 2006
CreatorsGrybaitė, Aušra
ContributorsMarcinkevičienė, Aušra, Venskutonienė, Egidija, Lazauskas, Petras, Sliesaravičius, Algirdas, Dabkevičius, Zenonas, Motuzas, Algirdas, Bobinas, Česlovas, Lithuanian University of Agriculture
PublisherLithuanian Academic Libraries Network (LABT), Lithuanian University of Agriculture
Source SetsLithuanian ETD submission system
LanguageLithuanian
Detected LanguageEnglish
TypeMaster thesis
Formatapplication/pdf
Sourcehttp://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060609_110947-63859
RightsUnrestricted

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